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ChenXingyu
mgqmu5wef 12 months ago
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commit 7bc5ce8611
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SqlData.java
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/*
* Description：用于支持小米便签最底层的数据库相关操作，和sqlnote的关系上是子集关系，即data是note的子集（节点）。
* SqlData其实就是也就是所谓数据中的数据
*/
package net.micode.notes.gtask.data;
/*
* 功能描述：
* 实现过程：
* 参数注解：
* Made By CuiCan
*/
public class SqlData {
/*
* 功能描述：得到类的简写名称存入字符串TAG中
* 实现过程：调用getSimpleName ()函数
* Made By CuiCan
*/
private static final String TAG = SqlData.class.getSimpleName();
private static final int INVALID_ID = -99999;//为mDataId置初始值-99999
/**
* 来自Notes类中定义的DataColumn中的一些常量
*/
// 集合了interface DataColumns中所有SF常量
public static final String[] PROJECTION_DATA = new String[] {
DataColumns.ID, DataColumns.MIME_TYPE, DataColumns.CONTENT, DataColumns.DATA1,
DataColumns.DATA3
};
/**
* 以下五个变量作为sql表中5列的编号
*/
public static final int DATA_ID_COLUMN = 0;
public static final int DATA_MIME_TYPE_COLUMN = 1;
public static final int DATA_CONTENT_COLUMN = 2;
public static final int DATA_CONTENT_DATA_1_COLUMN = 3;
public static final int DATA_CONTENT_DATA_3_COLUMN = 4;
private ContentResolver mContentResolver;
//判断是否直接用Content生成，是为true，否则为false
private boolean mIsCreate;
private long mDataId;
private String mDataMimeType;
private String mDataContent;
private long mDataContentData1;
private String mDataContentData3;
private ContentValues mDiffDataValues;
/*
* 功能描述：构造函数，用于初始化数据
* 参数注解：mContentResolver用于获取ContentProvider提供的数据
* 参数注解： mIsCreate表征当前数据是用哪种方式创建（两种构造函数的参数不同）
* 参数注解：
* Made By CuiCan
*/
public SqlData(Context context) {
mContentResolver = context.getContentResolver();
mIsCreate = true;
mDataId = INVALID_ID;//mDataId置初始值-99999
mDataMimeType = DataConstants.NOTE;
mDataContent = "";
mDataContentData1 = 0;
mDataContentData3 = "";
mDiffDataValues = new ContentValues();
}
/*
* 功能描述：构造函数，初始化数据
* 参数注解：mContentResolver用于获取ContentProvider提供的数据
* 参数注解： mIsCreate表征当前数据是用哪种方式创建（两种构造函数的参数不同）
* 参数注解：
* Made By CuiCan
*/
public SqlData(Context context, Cursor c) {
mContentResolver = context.getContentResolver();
mIsCreate = false;
loadFromCursor(c);
mDiffDataValues = new ContentValues();
}
/*
* 功能描述：从光标处加载数据
* 从当前的光标处将五列的数据加载到该类的对象
* Made By CuiCan
*/
private void loadFromCursor(Cursor c) {
mDataId = c.getLong(DATA_ID_COLUMN);
mDataMimeType = c.getString(DATA_MIME_TYPE_COLUMN);
mDataContent = c.getString(DATA_CONTENT_COLUMN);
mDataContentData1 = c.getLong(DATA_CONTENT_DATA_1_COLUMN);
mDataContentData3 = c.getString(DATA_CONTENT_DATA_3_COLUMN);
}
/*
* 功能描述：设置用于共享的数据，并提供异常抛出与处理机制
* 参数注解：
* Made By CuiCan
*/
public void setContent(JSONObject js) throws JSONException {
//如果传入的JSONObject对象中有DataColumns.ID这一项，则设置，否则设为INVALID_ID
long dataId = js.has(DataColumns.ID) ? js.getLong(DataColumns.ID) : INVALID_ID;
if (mIsCreate || mDataId != dataId) {
mDiffDataValues.put(DataColumns.ID, dataId);
}
mDataId = dataId;
String dataMimeType = js.has(DataColumns.MIME_TYPE) ? js.getString(DataColumns.MIME_TYPE)
: DataConstants.NOTE;
if (mIsCreate || !mDataMimeType.equals(dataMimeType)) {
mDiffDataValues.put(DataColumns.MIME_TYPE, dataMimeType);
}
mDataMimeType = dataMimeType;
String dataContent = js.has(DataColumns.CONTENT) ? js.getString(DataColumns.CONTENT) : "";
if (mIsCreate || !mDataContent.equals(dataContent)) {
mDiffDataValues.put(DataColumns.CONTENT, dataContent);
}
mDataContent = dataContent;
long dataContentData1 = js.has(DataColumns.DATA1) ? js.getLong(DataColumns.DATA1) : 0;
if (mIsCreate || mDataContentData1 != dataContentData1) {
mDiffDataValues.put(DataColumns.DATA1, dataContentData1);
}
mDataContentData1 = dataContentData1;
String dataContentData3 = js.has(DataColumns.DATA3) ? js.getString(DataColumns.DATA3) : "";
if (mIsCreate || !mDataContentData3.equals(dataContentData3)) {
mDiffDataValues.put(DataColumns.DATA3, dataContentData3);
}
mDataContentData3 = dataContentData3;
}
/*
* 功能描述：获取共享的数据内容，并提供异常抛出与处理机制
* 参数注解：
* Made By CuiCan
*/
public JSONObject getContent() throws JSONException {
if (mIsCreate) {
Log.e(TAG, "it seems that we haven't created this in database yet");
return null;
}
//创建JSONObject对象。并将相关数据放入其中，并返回。
JSONObject js = new JSONObject();
js.put(DataColumns.ID, mDataId);
js.put(DataColumns.MIME_TYPE, mDataMimeType);
js.put(DataColumns.CONTENT, mDataContent);
js.put(DataColumns.DATA1, mDataContentData1);
js.put(DataColumns.DATA3, mDataContentData3);
return js;
}
/*
* 功能描述：commit函数用于把当前造作所做的修改保存到数据库
* 参数注解：
* Made By CuiCan
*/
public void commit(long noteId, boolean validateVersion, long version) {
if (mIsCreate) {
if (mDataId == INVALID_ID && mDiffDataValues.containsKey(DataColumns.ID)) {
mDiffDataValues.remove(DataColumns.ID);
}
mDiffDataValues.put(DataColumns.NOTE_ID, noteId);
Uri uri = mContentResolver.insert(Notes.CONTENT_DATA_URI, mDiffDataValues);
try {
mDataId = Long.valueOf(uri.getPathSegments().get(1));
} catch (NumberFormatException e) {
Log.e(TAG, "Get note id error :" + e.toString());
throw new ActionFailureException("create note failed");
}
} else {
if (mDiffDataValues.size() > 0) {
int result = 0;
if (!validateVersion) {
result = mContentResolver.update(ContentUris.withAppendedId(
Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues, null, null);
} else {
result = mContentResolver.update(ContentUris.withAppendedId(
Notes.CONTENT_DATA_URI, mDataId), mDiffDataValues,
" ? in (SELECT " + NoteColumns.ID + " FROM " + TABLE.NOTE
+ " WHERE " + NoteColumns.VERSION + "=?)", new String[] {
String.valueOf(noteId), String.valueOf(version)
});
}
if (result == 0) {
Log.w(TAG, "there is no update. maybe user updates note when syncing");
}
}
}
mDiffDataValues.clear();
mIsCreate = false;
}
/*
* 功能描述：获取当前id
* 实现过程：
* 参数注解：
* Made By CuiCan
*/
public long getId() {
return mDataId;
}
}
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